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package com.techempower.js.legacy;

import java.util.*;

/**
 * Makes visitors for iterators.
 */
enum IteratorVisitorFactory implements VisitorFactory
{
  INSTANCE;

  @Override
  public Visitor visitor(Object object)
  {
    if (!(object instanceof Iterator))
    {
      throw new IllegalArgumentException("Argument is not an iterator.");
    }
    return new IteratorVisitor<>((Iterator) object);
  }

  /**
   * The Iterator Visitor implementation.
   */
  static final class IteratorVisitor implements Visitor
  {
    private final Iterator iterator;
    private E value;

    IteratorVisitor(Iterator iterator)
    {
      this.iterator = iterator;
    }

    @Override
    public boolean hasNext()
    {
      return this.iterator.hasNext();
    }

    @Override
    public boolean isArray()
    {
      return true;
    }

    @Override
    public String name()
    {
      throw new UnsupportedOperationException();
    }

    @Override
    public void next()
    {
      this.value = this.iterator.next();
    }

    @Override
    public Object value()
    {
      return this.value;
    }
  }
}
    

    

    

            

    

            



    
    






    
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